What does the word “Far” mean in “Far Infrared”? Why is that important?

Herschel Far Infrared emits the biologically most significant Comfort Heating wavelengths because skin content is 80% water which absorbs heat most efficiently from wavelengths of 3 microns and lower (Far Infrared). Far Infrared is better absorbed by the skin, is less transmissive (passes through) and is less reflected.

Infrared wavelengths themselves are divided into 3 distinct categories, due to the different physical characteristics of each wavelength.

“Medium Infrared”, “IRB” or “Medium Wave “ infrared heaters operate between 1,400 nm and 3,000 nm and emit temperatures around 1000°C. Applications of this technology include autoclaves and plastic welding. This is the wavelength sought by heat-seeking missiles.

“Far infrared”, “IRC”, “Long wave” or “Dark Radiators” operate in the wavelengths above 3,000 nm. Far Infrared elements emit much lower temperatures, typically around the 100°C mark and no visible light. This is the wavelength used in domestic “comfort” heating and Infrared Sauna applications.

“Far Infrared” is consequently the only applicable technology for a “comfort” heating application.

Please also see FAQ on Are there any standards governing Far Infrared Panels?